103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2014, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* parse.c: Parse an Empire command line
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*
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* Known contributors to this file:
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*
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*/
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#include <config.h>
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#include <ctype.h>
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#include "prototypes.h"
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/*
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* Parse user command in BUF.
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* BUF is UTF-8.
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* Command name and arguments are copied into SPACE[], whose size must
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* be at least strlen(BUF) + 1.
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* Set ARG[0] to the zero-terminated command name.
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* Set ARG[1..N] to the zero-terminated arguments, where N is the
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* number of arguments. Set ARG[N+1..127] to NULL.
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* Set TAIL[0..N] to beginning of ARG[0] in BUF[].
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* If CONDP is not null, recognize conditional argument syntax, and
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* set *CONDP to the conditional argument if present, else NULL.
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* If REDIR is not null, recognize redirection syntax, and set *REDIR
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* to UTF-8 redirection string if present, else NULL.
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* Return number of slots used in ARG[], or -1 on error.
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*/
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int
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parse(char *buf, char *space, char **arg,
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char **tail, char **condp, char **redir)
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{
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int i, quoted, argnum;
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if (redir)
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*redir = NULL;
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if (condp)
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*condp = NULL;
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for (argnum = 0; argnum < 127;) {
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for (; isspace(*(unsigned char *)buf); buf++) ;
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if (!*buf)
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break;
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/* recognize redirection syntax */
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if (redir && (*buf == '>' || *buf == '|')) {
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*redir = buf;
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break;
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}
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if (condp && *buf == '?') {
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buf++;
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*condp = space;
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} else {
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if (tail)
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tail[argnum] = buf;
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arg[argnum++] = space;
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}
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/* copy argument */
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quoted = 0;
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for (; *buf && (quoted || !isspace(*(unsigned char *)buf)); buf++) {
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if (*buf == '"')
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quoted = !quoted;
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else if ((*buf >= 0x20 && *buf <= 0x7e) || *buf == '\t')
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*space++ = *buf;
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/* else funny character; ignore */
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}
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*space++ = 0;
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}
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for (i = argnum; i < 128; i++) {
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arg[i] = NULL;
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if (tail)
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tail[i] = NULL;
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}
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return argnum;
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}
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